JP6046983B2 - Electric pump - Google Patents

Description

  The present invention relates to an electric pump.

  Conventionally, a rotor storage chamber communicating with a pump chamber into which a liquid flows, a rotor rotatably stored in the rotor storage chamber, a stator that forms a rotating magnetic field in the rotor, and a control board that controls the stator are provided. An electric pump is known (see, for example, Patent Document 1).

JP 2004-360614 A

  Such an electric pump is required to have a cooling property and an electromagnetic shielding property with respect to the control board.

  Then, an object of this invention is to provide the electric pump which can ensure the cooling property and electromagnetic shielding property with respect to a control board.

In order to solve the above problem, the electric pump according to claim 1 is formed with a housing in which a peripheral wall portion of a rotor accommodating chamber communicating with a pump chamber into which liquid flows is formed, and a bottom wall portion of the rotor accommodating chamber. A base member made of metal, a rotor rotatably accommodated in the rotor accommodating chamber, a stator provided around the peripheral wall portion to form a rotating magnetic field on the rotor, and the rotor on the bottom wall portion A control board that is superimposed from the opposite side of the storage chamber and controls the stator, an enclosure that surrounds the control board, and a covering that covers the control board from the opposite side of the bottom wall with respect to the control board. and a shield cover which is formed of a ferromagnetic material, disposed between the stator and the surrounding portion has a holding portion for holding the stator, the control board with the shield cover Osamu To form the board housing chamber which is provided with a stator holder is formed of a ferromagnetic material.

  According to this electric pump, the bottom wall portion of the rotor accommodating chamber is formed on the metal base member, and the control board is superimposed on the bottom wall portion from the side opposite to the rotor accommodating chamber. Therefore, since the heat of the control board can be absorbed through the bottom wall portion by the liquid flowing into the rotor housing chamber, the control board can be cooled (water cooled). Thereby, the cooling property with respect to a control board is securable.

  In addition, this electric pump has a shield cover formed of a ferromagnetic material, and the control board is surrounded by the shield cover surrounding portion and is opposed to the bottom wall portion by the shield cover covering portion. Covered from the side. Therefore, since the control board is shielded by the shield cover formed of this ferromagnetic material, it is possible to ensure the electromagnetic shielding property against the control board.

Moreover, according to this electric pump, the stator holder formed with the ferromagnetic material is provided, This stator holder forms the board | substrate accommodation chamber which accommodates a control board with a shield cover. Therefore, since the area | region which shields a control board by the stator holder formed with this ferromagnetic body is expanded, the electromagnetic shielding property with respect to a control board can be improved.

  In addition, since the substrate housing chamber is formed by the stator holder having the holding portion for holding the stator (since the member for holding the stator and the member for forming the substrate housing chamber are combined), the increase in the number of members is suppressed. can do. Thereby, cost can be reduced.

The electric pump according to claim 2 is the electric pump according to claim 1 , wherein the stator holder has an opening through which the peripheral wall portion is inserted, and the rotor faces the opening and is ferromagnetic. It is the structure which has the yoke formed of the body.

  According to this electric pump, the stator holder has an opening through which the peripheral wall portion is inserted, but the yoke of the rotor is formed of a ferromagnetic material and is opposed to the opening. Therefore, since the shielding property of the opening can be enhanced by this yoke, the electromagnetic shielding property with respect to the control board can be further improved.

The electric pump according to claim 3 is the electric pump according to claim 1 or 2 , wherein the shield cover forms an outer shape of the electric pump, the shield cover, the stator holder, and the The stator holder and the base member each have a connection portion.

  According to this electric pump, the shield cover forms the outer shape of the electric pump. Therefore, the control cover covered with the shield cover can be cooled (air-cooled) when the shield cover is exposed to the outside air and cooled.

  In addition, the shield cover and the stator holder, and the stator holder and the base member each have a connection portion. Accordingly, the base member can be cooled via each connection portion by cooling the shield cover by being exposed to the outside air. Thereby, since the control board superimposed on the bottom wall part formed in this base member can be cooled (air cooling), the cooling property with respect to a control board can be improved.

The electric pump according to claim 4 is the electric pump according to claim 3 , wherein a connection portion between the shield cover and the stator holder is formed at a peripheral edge of the shield cover, and the stator. A second flange formed on the peripheral edge of the holder and coupled to the first flange is used.

  According to this electric pump, the connecting portion between the shield cover and the stator holder includes a first flange formed at the peripheral portion of the shield cover, and a second flange formed at the peripheral portion of the stator holder and coupled to the first flange. And have. Therefore, since the connection area using the flange can secure the connection area between the shield cover and the stator holder, it is possible to improve the heat transfer between the shield cover and the stator holder. Thereby, since the bottom wall part formed in the base member can be cooled more, the cooling property with respect to the control board superimposed on this bottom wall part can be improved more.

In order to solve the above-mentioned problem, the electric pump according to claim 5 is formed with a housing in which a peripheral wall portion of a rotor accommodating chamber communicating with a pump chamber into which a liquid flows is formed, and a bottom wall portion of the rotor accommodating chamber. A base member made of metal, a rotor rotatably accommodated in the rotor accommodating chamber, a stator provided around the peripheral wall portion to form a rotating magnetic field on the rotor, and the rotor on the bottom wall portion A control board that is superimposed from the opposite side of the storage chamber and controls the stator, an enclosure that surrounds the control board, and a covering that covers the control board from the opposite side of the bottom wall with respect to the control board. and a shield cover which is formed of a ferromagnetic material, wherein is formed in a base member, provided with a, a holding portion for holding the stator provided between the stator and the surrounding portion .

According to this electric pump, the bottom wall portion of the rotor accommodating chamber is formed on the metal base member, and the control board is superimposed on the bottom wall portion from the side opposite to the rotor accommodating chamber. Therefore, since the heat of the control board can be absorbed through the bottom wall portion by the liquid flowing into the rotor housing chamber, the control board can be cooled (water cooled). Thereby, the cooling property with respect to a control board is securable.
In addition, this electric pump has a shield cover formed of a ferromagnetic material, and the control board is surrounded by the shield cover surrounding portion and is opposed to the bottom wall portion by the shield cover covering portion. Covered from the side. Therefore, since the control board is shielded by the shield cover formed of this ferromagnetic material, it is possible to ensure the electromagnetic shielding property against the control board.
In addition, according to this electric pump, the base member has a holding portion that holds the stator in addition to the bottom wall portion of the rotor accommodating chamber (the member that forms the bottom wall portion of the rotor accommodating chamber and the stator). It also serves as a holding member). Therefore, the increase in the number of members can be suppressed, and the cost can be reduced.

The electric pump according to claim 6 is the electric pump according to claim 5 , wherein the shield cover forms an outer portion of the electric pump, and the shield cover and the base member have a connection portion. It is said that.

  According to this electric pump, the shield cover forms the outer shape of the electric pump. Therefore, the control cover covered with the shield cover can be cooled (air-cooled) when the shield cover is exposed to the outside air and cooled.

  In addition, the shield cover and the base member have a connection portion. Therefore, the base member can be cooled via the connection portion by cooling the shield cover by being exposed to the outside air. Thereby, since the control board superimposed on the bottom wall part formed in this base member can be cooled (air cooling), the cooling property with respect to a control board can be improved.

The electric pump according to claim 7 is the electric pump according to claim 6 , wherein the connection portion is formed on a first flange formed on a peripheral portion of the shield cover, and on a peripheral portion of the base member. The second flange is coupled to the first flange.

  According to this electric pump, the connecting portion between the shield cover and the base member includes a first flange formed on the peripheral portion of the shield cover, and a second flange formed on the peripheral portion of the base member and coupled to the first flange. And have. Therefore, by using the connection portion using the flange, the connection area between the shield cover and the base member can be ensured, so that the heat transfer between the shield cover and the base member can be improved. Thereby, since the bottom wall part formed in the base member can be cooled more, the cooling property with respect to the control board superimposed on this bottom wall part can be improved more.

The electric pump according to claim 8 is the electric pump according to any one of claims 1 to 7 , wherein an extension flange extending toward the enclosure portion is formed in the holding portion, and the control board. In addition, an extension portion extending on the same side as the extension flange is formed, and an electrical component is disposed in a space portion formed between the extension flange and the extension portion on the side of the holding portion. ing.

  According to this electric pump, a space portion is formed between the extension flange and the extension portion on the side of the holding portion, and electrical components are arranged in the space portion. Therefore, since this space part is utilized for arrangement | positioning of an electrical component, an electric pump can be reduced in size.

The electric pump according to claim 9 is the electric pump according to any one of claims 1 to 8 , wherein the electric pump projects toward the rotor housing chamber side and is connected to the peripheral wall portion at the bottom wall portion. Or the protrusion part which protrudes inside the said rotor storage chamber is formed, and it is set as the structure by which the heat-emitting component was provided in the position corresponding to the said protrusion part in the said control board.

  According to this electric pump, the bottom wall portion is formed with a protruding portion that protrudes toward the rotor accommodating chamber and is connected to the peripheral wall portion or protrudes into the rotor accommodating chamber. Therefore, the contact area between the liquid in the rotor accommodating chamber and the bottom wall portion can be increased by the protruding portion, so that the bottom wall portion can be further cooled.

  In addition, the heat generating component of the control board is provided at a position corresponding to the protruding portion on the control board. Therefore, the heat of the heat generating component can be efficiently absorbed through the protruding portion. Thereby, the cooling property with respect to a heat-emitting component can be improved.

It is a longitudinal section of the electric pump concerning a first embodiment of the present invention. It is a disassembled perspective view of the electric pump shown by FIG. It is a principal part expanded longitudinal cross-sectional view which shows the modification of the electric pump shown by FIG. It is a longitudinal cross-sectional view of the electric pump which concerns on 2nd embodiment of this invention. It is a disassembled perspective view of the electric pump shown by FIG.

[First embodiment]
First, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the electric pump 10 according to the first embodiment of the present invention includes a housing 12, a base member 14, a rotor 16, a stator 18, a control board 20, a shield cover 22, and a stator. And a holder 24 (see also FIG. 2 as appropriate).

  The housing 12 is made of resin. The housing 12 integrally includes a plate-shaped housing body 26 and a peripheral wall portion 30 of a rotor accommodating chamber 28 that accommodates the rotor 16. A connector 32 is provided at one end of the housing body 26, and the peripheral wall portion 30 of the rotor housing chamber 28 is formed at a position closer to the other end than the central portion of the housing body 26. The peripheral wall portion 30 is formed in a cylindrical shape and protrudes to one side (the arrow Z1 side) in the plate thickness direction of the housing body 26. Further, the distal end portion 30A of the peripheral wall portion 30 is reduced in diameter as compared with the portion on the rear end side with respect to the distal end portion 30A.

  The rotor accommodating chamber 28 has an opening 28A, and this opening 28A is opened on the other side (arrow Z2 side) in the plate thickness direction of the housing body 26. The electric pump 10 is preferably used as, for example, a water pump that circulates engine coolant, and the rotor housing chamber 28 has the housing 12 attached to an attachment object 34 (for example, an engine block of an automobile). In this case, the pump chamber 36 formed in the attachment object 34 is communicated.

  The base member 14 is made of, for example, an aluminum alloy as an example of a metal having high heat conductivity and conductivity. The base member 14 is formed with a bottom wall portion 31 of the rotor accommodating chamber 28, and a joining portion 38 and a shaft support portion 40 are formed on the bottom wall portion 31. The joint portion 38 and the shaft support portion 40 are each formed in a cylindrical shape.

  The joint portion 38 is formed on the outer side in the radial direction of the shaft support portion 40, and is formed coaxially with the distal end portion 30 </ b> A of the peripheral wall portion 30. The joint portion 38 protrudes toward the rotor accommodating chamber 28 and is joined to the outer peripheral portion of the distal end portion 30 </ b> A of the peripheral wall portion 30. A sealing material 42 such as an O-ring is provided between the inner peripheral portion of the joint portion 38 and the outer peripheral portion of the distal end portion 30 </ b> A of the peripheral wall portion 30.

  The shaft support portion 40 is formed on the radially inner side of the peripheral wall portion 30 and protrudes into the rotor accommodating chamber 28. One end of a shaft 44 extending in the axial direction of the rotor accommodating chamber 28 is press-fitted inside the shaft support portion 40, whereby the shaft 44 is supported by the shaft support portion 40. In addition, this junction part 38 and the shaft support part 40 are examples of the protrusion part in this invention.

  The rotor 16 is rotatably accommodated in the rotor accommodating chamber 28. The rotor 16 is rotatably supported on the shaft 44 via a bearing 46. The rotor 16 includes an impeller member 48, a yoke 50, and a magnet 52.

  The impeller member 48 has a cylindrical shaft portion 54, and the shaft portion 54 is fixed to the outer peripheral portion of the bearing 46. Further, the impeller member 48 is formed with an impeller 56 that protrudes through the opening 28A of the rotor housing chamber 28 to the other side (arrow Z2 side) of the housing body 26 in the plate thickness direction. The impeller 56 is accommodated in the pump chamber 36 described above. When the impeller 56 rotates in the pump chamber 36, the liquid flows into the pump chamber 36 and the liquid is discharged from the pump chamber 36. In addition, since the rotor storage chamber 28 communicates with the pump chamber 36, when the liquid flows into the pump chamber 36, the rotor storage chamber 28 is filled with the liquid.

  The yoke 50 is formed in an annular shape and is fixed to the outer peripheral portion of the shaft portion 54. The yoke 50 is made of a ferromagnetic material such as soft iron. The magnet 52 is formed in an annular shape or an arc shape along the outer peripheral portion of the yoke 50, and is fixed to the outer peripheral portion of the yoke 50.

  The stator 18 is provided around the peripheral wall portion 30, and faces the rotor 16 in the radial direction via the peripheral wall portion 30. The stator 18 includes an annular stator core 58, an insulator 60 attached to the stator core 58, and a winding 62 wound around the stator core 58 via the insulator 60. In the electric pump 10, when a rotating magnetic field is formed by the stator 18, suction and repulsive force acts on the rotor 16, and the rotor 16 is rotated.

  The control board 20 includes a board main body 64 such as a printed board and a plurality of mounting components 66. The substrate body 64 is superimposed on the bottom wall portion 31 from the side opposite to the rotor accommodating chamber 28. The substrate main body 64 may be overlapped with the bottom wall portion 31 via an inclusion such as a heat transfer sheet or a heat transfer gel between the substrate main body 64 and the bottom wall portion 31. The plurality of mounting components 66 are mounted on the surface of the substrate body 64 opposite to the bottom wall portion 31 side.

  The plurality of mounting components 66 include a plurality of heat generating components 68 and 70. The plurality of heat generating components 68 and 70 are, for example, control elements for controlling the stator 18. Among the plurality of heat generating components 68, 70, the heat generating component 68 is provided at a position corresponding to the joint portion 38 on the control board 20, and the heat generating component 70 is located at a position corresponding to the shaft support portion 40 on the control board 20. Is provided. That is, the heat generating component 68 is arranged so that at least a part thereof overlaps at least a part of the joint portion 38 in a plan view of the control board 20, and the heat generating part 70 has at least a part of the control board 20. It arrange | positions so that it may overlap with at least one part of the shaft support part 40 by planar view.

  The shield cover 22 is formed of a ferromagnetic material such as iron. The shield cover 22 surrounds the control board 20 from the side opposite to the bottom wall 31 with respect to the control board 20 and the surrounding part 72 surrounding the control board 20 and the base member 14 and a holding part 76 of the stator holder 24 described later. And a covering portion 74 for covering. The shield cover 22 forms the outer shape of the electric pump 10 (that is, the outermost portion of the electric pump 10 that is exposed to the outside air).

  The stator holder 24 is made of a ferromagnetic material such as iron. The stator holder 24 has a cylindrical holding portion 76. The holding portion 76 is provided between the stator 18 and the surrounding portion 72. The outer peripheral portion (tip portion of the teeth) of the stator core 58 is press-fitted into the inner peripheral portion of the holding portion 76, whereby the stator 18 is held by the holding portion 76.

  An extension flange 78 extending toward the enclosure portion 72 along the plate-shaped housing body 26 is formed at the end of the holding portion 76 on the housing body 26 side. Furthermore, a first flange 80 is formed on the peripheral edge of the shield cover 22 described above, and a second flange 82 is formed on the peripheral edge of the stator holder 24. The first flange 80 and the second flange 82 are coupled to each other by a fastener or the like. The first flange 80 and the second flange 82 are an example of a connection portion between the shield cover 22 and the stator holder 24.

  In this way, the shield cover 22 and the stator holder 24 are fixed to each other, so that a substrate housing chamber 84 is formed by the shield cover 22 and the stator holder 24. The above-described control substrate 20 is accommodated in the substrate accommodation chamber 84.

  Further, an extension portion 86 extending on the same side as the above-described extension flange 78 is formed on the substrate body 64 of the control board 20. In the space 88 formed between the extension flange 78 and the extension 86 on the side of the holding portion 76, an electric component 90 larger than the mounting component 66 is disposed. The electrical component 90 is, for example, a noise prevention element, and is mounted on the surface of the substrate body 64 on the bottom wall portion 31 side. The base member 14 is formed with a support portion 92 extending from the bottom wall portion 31 to the same side as the extension portion 86, and the extension portion 86 is overlapped with the support portion 92.

  An opening 94 that opens in the axial direction of the rotor accommodating chamber 28 is formed at the end of the holding portion 76 of the stator holder 24 on the bottom wall 31 side. The opening 94 has the above-described peripheral wall. The part 30 is inserted. Further, the yoke 50 of the rotor 16 described above is disposed so as to face the opening 94. Further, the peripheral edge 94A of the opening 94 extends from the end on the bottom wall 31 side of the holding portion 76 toward the inside in the radial direction of the holding portion 76, and the peripheral edge 94A of the opening 94 includes Projections 96 such as bosses and peripheral edges formed on the base member 14 are connected (contacted). The peripheral edge 94 </ b> A and the protrusion 96 of the opening 94 are an example of a connection portion between the stator holder 24 and the base member 14.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  According to the electric pump 10 according to the first embodiment of the present invention, the bottom wall portion 31 of the rotor accommodating chamber 28 is formed on the metal base member 14, and the rotor housing is accommodated in the bottom wall portion 31. The control board 20 is superposed from the side opposite to the chamber 28. Therefore, since the heat of the control board 20 can be absorbed by the liquid flowing into the rotor accommodating chamber 28 through the bottom wall portion 31, the control board 20 can be cooled (water cooled). Thereby, the cooling property with respect to the control board 20 is securable.

  Moreover, the electric pump 10 has a shield cover 22 formed of a ferromagnetic material, and the control board 20 is surrounded by the surrounding portion 72 of the shield cover 22 and the covering portion of the shield cover 22. 74 is covered from the side opposite to the bottom wall 31. Therefore, since the control board 20 is shielded by the shield cover 22 formed of this ferromagnetic material, it is possible to ensure the electromagnetic shielding property against the control board 20.

  Further, the electric pump 10 is provided with a stator holder 24 formed of a ferromagnetic material, and the stator holder 24 forms a substrate accommodating chamber 84 that accommodates the control substrate 20 together with the shield cover 22. . Therefore, since the area | region which shields the control board 20 with the stator holder 24 formed with this ferromagnetic body is expanded, the electromagnetic shielding property with respect to the control board 20 can be improved.

  Moreover, since the substrate housing chamber 84 is formed by the stator holder 24 having the holding portion 76 that holds the stator 18 (since the member that holds the stator 18 and the member that forms the substrate housing chamber 84 are combined), An increase in the number of members can be suppressed. Thereby, cost can be reduced.

  The stator holder 24 has an opening 94 through which the peripheral wall 30 is inserted. The yoke 50 of the rotor 16 is formed of a ferromagnetic material and faces the opening 94. Therefore, since the shielding performance of the opening 94 can be enhanced by the yoke 50, the electromagnetic shielding performance against the control board 20 can be further improved.

  Further, the shield cover 22 forms the outer shape of the electric pump 10. Therefore, when the shield cover 22 is exposed to the outside air and cooled, the control board 20 covered with the shield cover 22 can be cooled (air cooled).

  Moreover, the shield cover 22 and the stator holder 24, and the stator holder 24 and the base member 14 are connected to each other. Therefore, when the shield cover 22 is cooled by being exposed to the outside air, the base member 14 can be cooled via each connection portion. Thereby, since the control board 20 superimposed on the bottom wall part 31 formed in this base member 14 can be cooled (air cooling), the cooling property with respect to the control board 20 can be improved.

  In particular, the connecting portion between the shield cover 22 and the stator holder 24 includes a first flange 80 formed at the peripheral edge of the shield cover 22 and a second flange formed at the peripheral edge of the stator holder 24 and coupled to the first flange 80. The flange 82 is used. Therefore, since the connection area using the flange can secure the connection area between the shield cover 22 and the stator holder 24, the heat transfer between the shield cover 22 and the stator holder 24 can be improved. it can. Thereby, since the bottom wall part 31 formed in the base member 14 can be cooled more, the cooling property with respect to the control board 20 superimposed on this bottom wall part 31 can be improved more.

  A space 88 is formed between the extension flange 78 and the extension 86 on the side of the holding portion 76, and a large electrical component 90 is disposed in the space 88. Therefore, since the space 88 is used for arranging the electric component 90, the electric pump 10 can be reduced in size.

  Further, the bottom wall portion 31 is formed with a joint portion 38 projecting toward the rotor housing chamber 28 and connected to the peripheral wall portion 30, and a shaft support portion 40 projecting into the rotor housing chamber 28. Therefore, since the contact area between the liquid in the rotor accommodating chamber 28 and the bottom wall portion 31 can be enlarged by the joint portion 38 and the shaft support portion 40, the bottom wall portion 31 can be further cooled.

  In addition, the heat generating components 68 and 70 of the control board 20 are provided at positions corresponding to the joint portion 38 and the shaft support portion 40 in the control board 20, respectively. Therefore, the heat of the heat generating components 68 and 70 can be efficiently absorbed through the joint portion 38 and the shaft support portion 40. Thereby, the cooling property with respect to the heat-emitting components 68 and 70 can be improved.

  Next, a modification of the first embodiment of the present invention will be described.

  In the first embodiment of the present invention, the pump chamber 36 is formed on the attachment target 34 of the electric pump 10, but may be formed on the electric pump 10 (the electric pump 10 includes the pump chamber 36). May be).

  Further, the substrate main body 64 of the control substrate 20 is overlaid on the bottom wall portion 31. However, as shown in FIG. 3, the mounting component 66 is mounted on the surface of the substrate main body 64 on the bottom wall portion 31 side, and this mounting component 66 is superimposed on the bottom wall portion 31 from the side opposite to the rotor accommodating chamber 28. May be. In this case, the mounting component 66 may be overlapped with the bottom wall portion 31 via an inclusion such as a heat transfer sheet or a heat transfer gel between the bottom wall portion 31 and the heat generating component. 68 and 70 may be provided at positions corresponding to the joint portion 38 and the shaft support portion 40 in the control board 20, respectively.

  Further, although the joint portion 38 protrudes toward the rotor accommodating chamber 28 side, it may be formed in the bottom wall portion 31 in a concave shape. Similarly, the shaft 44 member may be formed in the bottom wall portion 31 in a concave shape.

  The connecting portion between the shield cover 22 and the stator holder 24 is a first flange 80 formed at the peripheral edge of the shield cover 22 and a second flange 82 formed at the peripheral edge of the stator holder 24. Other connection portions may be provided.

  Further, the connecting portion between the stator holder 24 and the base member 14 is the peripheral portion 94A of the opening 94 formed in the holding portion 76 and the protrusion 96 formed in the base member 14, but other connections are possible. You may have a part.

  The plurality of modified examples can be implemented in combination as appropriate.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  The electric pump 110 according to the second embodiment of the present invention shown in FIGS. 4 and 5 is as follows with respect to the electric pump 10 (see FIGS. 1 to 3) according to the first embodiment of the present invention described above. The configuration has been changed.

  That is, in the electric pump 110 according to the second embodiment of the present invention, the stator holder 24 is formed in a cylindrical shape. The outer peripheral portion (tip portion of teeth) of the stator core 58 is press-fitted into the inner peripheral portion of the stator holder 24.

  The base member 14 has a cylindrical holding portion 176. The holding portion 176 is provided between the stator 18 and the surrounding portion 72 (more specifically, between the stator holder 24 and the surrounding portion 72). Inside the holding portion 176, the stator 18 is housed together with the stator holder 24, and the stator 18 is held by the holding portion 176 together with the stator holder 24.

  An extension flange 178 extending toward the enclosure portion 72 along the plate-like housing body 26 is formed at the end of the holding portion 176 on the housing body 26 side. Further, a second flange 182 is formed on the periphery of the base member 14 at a position corresponding to the first flange 80 formed on the periphery of the shield cover 22. The first flange 80 and the second flange 182 are coupled to each other by a fastener or the like. The first flange 80 and the second flange 182 are an example of a connection portion between the shield cover 22 and the base member 14.

  In this way, the shield cover 22 and the base member 14 are fixed to each other, so that a substrate housing chamber 184 is formed by the shield cover 22 and the base member 14. The above-described control substrate 20 is accommodated in the substrate accommodation chamber 184.

  The extension 86 formed on the substrate body 64 extends to the same side as the extension flange 178 and protrudes toward the enclosure 72 with respect to the bottom wall 31 of the base member 14. A space portion 188 is formed between the extension flange 178 and the extension portion 86 on the side of the holding portion 176, and the large electrical component 90 described above is disposed in the space portion 188. .

  In the second embodiment of the present invention, the configuration other than the above is the same as that of the first embodiment of the present invention described above.

  Next, the operation and effect of the second embodiment of the present invention will be described.

  Also in the electric pump 110 according to the second embodiment of the present invention, the metal base member 14 is formed with the bottom wall portion 31 of the rotor accommodating chamber 28, and the bottom wall portion 31 includes the rotor accommodating chamber. The control board 20 is superposed from the side opposite to that 28. Therefore, since the heat of the control board 20 can be absorbed by the liquid flowing into the rotor accommodating chamber 28 through the bottom wall portion 31, the control board 20 can be cooled (water cooled). Thereby, the cooling property with respect to the control board 20 is securable.

  Moreover, the electric pump 110 has a shield cover 22 formed of a ferromagnetic material, and the control board 20 is surrounded by the surrounding portion 72 of the shield cover 22 and the covering portion of the shield cover 22. 74 is covered from the side opposite to the bottom wall 31. Therefore, since the control board 20 is shielded by the shield cover 22 formed of this ferromagnetic material, it is possible to ensure the electromagnetic shielding property against the control board 20.

  The base member 14 includes a holding portion 176 that holds the stator 18 in addition to the bottom wall portion 31 of the rotor accommodating chamber 28 (the member that forms the bottom wall portion 31 of the rotor accommodating chamber 28 and the stator 18). It also serves as a member that holds Therefore, the increase in the number of members can be suppressed, and the cost can be reduced.

  Further, the shield cover 22 forms the outer shape of the electric pump 110. Therefore, when the shield cover 22 is exposed to the outside air and cooled, the control board 20 covered with the shield cover 22 can be cooled (air cooled).

  Moreover, the shield cover 22 and the base member 14 are connected to each other. Therefore, the base member 14 can be cooled through the connection portion with the shield cover 22 by cooling the shield cover 22 by being exposed to the outside air. Thereby, since the control board 20 superimposed on the bottom wall part 31 formed in this base member 14 can be cooled (air cooling), the cooling property with respect to the control board 20 can be improved.

  In particular, the connecting portion between the shield cover 22 and the base member 14 includes a first flange 80 formed at the peripheral portion of the shield cover 22 and a second flange formed at the peripheral portion of the base member 14 and coupled to the first flange 80. The flange 182 is used. Therefore, since the connection area using the flange can secure the connection area between the shield cover 22 and the base member 14, the heat transfer between the shield cover 22 and the base member 14 can be improved. it can. Thereby, since the bottom wall part 31 formed in the base member 14 can be cooled more, the cooling property with respect to the control board 20 superimposed on this bottom wall part 31 can be improved more.

  Further, a space portion 188 is formed between the extension flange 178 and the extension portion 86 on the side of the holding portion 176, and a large electric component 90 is disposed in the space portion 188. Therefore, since the space 188 is used for the arrangement of the electric component 90, the electric pump 110 can be reduced in size.

  Further, the bottom wall portion 31 is formed with a joint portion 38 projecting toward the rotor housing chamber 28 and connected to the peripheral wall portion 30, and a shaft support portion 40 projecting into the rotor housing chamber 28. Therefore, since the contact area between the liquid in the rotor accommodating chamber 28 and the bottom wall portion 31 can be enlarged by the joint portion 38 and the shaft support portion 40, the bottom wall portion 31 can be further cooled.

  In addition, the heat generating components 68 and 70 of the control board 20 are provided at positions corresponding to the joint portion 38 and the shaft support portion 40 in the control board 20, respectively. Therefore, the heat of the heat generating components 68 and 70 can be efficiently absorbed through the joint portion 38 and the shaft support portion 40. Thereby, the cooling property with respect to the heat-emitting components 68 and 70 can be improved.

  Note that, in the second embodiment of the present invention, it is possible to adopt a modification similar to that of the first embodiment of the present invention described above.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. is there.

DESCRIPTION OF SYMBOLS 10,110 ... Electric pump, 12 ... Housing, 14 ... Base member, 16 ... Rotor, 18 ... Stator, 20 ... Control board, 22 ... Shield cover, 24 ... Stator holder, 26 ... Housing main body, 28 ... Rotor accommodating chamber, 28A ... Opening, 30 ... Peripheral wall part, 30A ... Tip part, 31 ... Bottom wall part, 32 ... Connector, 34 ... Attachment object, 36 ... Pump chamber, 38 ... Joint part, 40 ... Shaft support part, 42 ... Sealing material , 44 ... Shaft, 46 ... Bearing, 48 ... Impeller member, 50 ... Yoke, 52 ... Magnet, 54 ... Shaft, 56 ... Impeller, 58 ... Stator core, 60 ... Insulator, 62 ... Winding, 64 ... Substrate body, 66 ... mounted parts, 68, 70 ... heat generating parts, 72 ... surrounding part, 74 ... covering part, 76, 176 ... holding part, 78, 178 ... extension flange, 80 ... first flange 82, 182 ... second flange, 84, 184 ... substrate housing chamber, 86 ... extension, 88, 188 ... space, 90 ... electrical component, 92 ... support, 94 ... opening, 94A ... peripheral edge, 96 ... protrusion

Claims (9)

A housing in which a peripheral wall portion of a rotor accommodating chamber communicating with a pump chamber into which a liquid flows is formed;
A metal base member formed with a bottom wall portion of the rotor accommodating chamber;
A rotor rotatably accommodated in the rotor accommodating chamber;
A stator provided around the peripheral wall and forming a rotating magnetic field in the rotor;
A control board that is superimposed on the bottom wall portion from the opposite side of the rotor accommodating chamber and controls the stator;
A shield cover formed of a ferromagnetic material, having a surrounding portion that surrounds the control substrate, and a covering portion that covers the control substrate from a side opposite to the bottom wall portion with respect to the control substrate;
A stator provided between the stator and the surrounding portion and having a holding portion for holding the stator, and forming a substrate housing chamber for housing the control substrate together with the shield cover, and a stator formed of a ferromagnetic material A holder,
Electric pump equipped with. The stator holder has an opening through which the peripheral wall portion is inserted,
The rotor has a yoke formed of a ferromagnetic material facing the opening.
The electric pump according to claim 1 . The shield cover forms the outer shape of the electric pump,
The shield cover and the stator holder, and the stator holder and the base member each have a connection portion.
The electric pump according to claim 1 or 2 . A connecting portion between the shield cover and the stator holder includes a first flange formed at a peripheral portion of the shield cover, and a second flange formed at a peripheral portion of the stator holder and coupled to the first flange. Have
The electric pump according to claim 3 . A housing in which a peripheral wall portion of a rotor accommodating chamber communicating with a pump chamber into which a liquid flows is formed;
A metal base member formed with a bottom wall portion of the rotor accommodating chamber;
A rotor rotatably accommodated in the rotor accommodating chamber;
A stator provided around the peripheral wall and forming a rotating magnetic field in the rotor;
A control board that is superimposed on the bottom wall portion from the opposite side of the rotor accommodating chamber and controls the stator;
A shield cover formed of a ferromagnetic material, having a surrounding portion that surrounds the control substrate, and a covering portion that covers the control substrate from a side opposite to the bottom wall portion with respect to the control substrate;
A holding portion that is formed on the base member and is provided between the stator and the surrounding portion and holds the stator;
An electric pump according to claim. The shield cover forms the outer shape of the electric pump,
The shield cover and the base member have a connection portion.
The electric pump according to claim 5 . The connection portion includes a first flange formed at a peripheral portion of the shield cover, and a second flange formed at a peripheral portion of the base member and coupled to the first flange.
The electric pump according to claim 6 . The holding portion is formed with an extension flange extending toward the surrounding portion,
The control board is formed with an extension extending on the same side as the extension flange,
In the space formed between the extension flange and the extension part on the side of the holding part, electrical components are arranged,
Electric pump according to any one of claims 1 to 7. The bottom wall portion is protruded toward the rotor accommodating chamber and connected to the peripheral wall portion, or a protruding portion protruding into the rotor accommodating chamber is formed,
A heat generating component is provided at a position corresponding to the protruding portion on the control board.
The electric pump as described in any one of Claims 1-8 .

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